#11284
======

Hashed collection performance improvement, phase 4 of 4. 

Changes identityHash to cover most of the positive SmallInteger range, and uses 
good prime table sizes. This makes large hashed collections much faster, and 
does not penalize the small ones.

Targeted at Pharo Core 1.1-11280

Load the slice for each phase in order. Allow maybe half an hour to load all 
four phases; the intermediate phases load very slowly due to existing hashed 
collections running in "slow but safe" mode while their hash function changes 
under them.

In phase 4:

* All of the scanFor: methods modified in phase 1 are loaded into their final 
form (sometimes a revert to original) which does not scan the entire table 
before giving up.

* The rehashing class and temporary methods are removed, having done their job 
at the end of phase 3.

--
Marcus Denker  -- http://www.marcusdenker.de
INRIA Lille -- Nord Europe. Team RMoD.


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